Open Office has a terrific feature that lets one add a horizontal line by placing four dashes in a new paragraph. However, it is not clear to the user that the horizontal line is actually a border to the preceding paragraph, rather (due to the manner in which it is added) it is perceived as being an entity all its own. Therefore it is not clear to the user how to remove it.

Users try to backspace over the "entity" that is the horizontal line, and this of course does not work. Sometimes users try to highlight it and then press Enter, which results in a _second_ horizontal line appearing!

Please devise an intuitive way to remove this horizontal line. I can make suggestions based on what users try to do to the line to remove it.